The authors present measurements of recoil proton polarization for {sup 1}H({rvec {gamma}},{rvec p}){pi}{sup 0} in and above the resonance region. These are the first data in this reaction for polarization transfer with circularly polarized photons. The results are compared to phase shift analyses and quark model calculations.

For the first time, a superconducting solenoid (SCM) was used to increase the remnant magnetization of sintered NdFeB permanent magnets (PMs). In particular, improved magnetic alignment of commercial-grade PM powder was achieved, as it was axial die pressed into 12.7-mm diameter cylindrical compacts in the 76.2-mm warm bore of a 9-T SCM. The press used to compact the powder is unique and was specifically designed for use with the SCM. Although the press was operated in the batch mode for this proof of concept study, its design is intended to enable automated production. In operation, a simple die and punch set made of nonmagnetic materials was filled with powder and loaded into a nonmagnetic press tube. The cantilevered press tube was inserted horizontally, on a carrier manually advanced along a track, into the SCM. The robustness of the mechanical components and the SCM, in its liquid helium dewar, were specifically designed to allow for insertion and extraction of the magnetic powder and compacts, while operating at 9 T. Compaction was achieved by pressing the punches between the closed end of the press tube and the hydraulic cylinder mounted on the opposite end. Improvements up to 10% in magnetization and 20% …

The stabilization of transuranics (TRU) in a PWR fuel cycle was evaluated for the CORAIL assembly. Alternative assembly designs (a highly moderated and modified CORAIL-TRU assembly and a homogeneous Thorium-TRU assembly) were also investigated to assess the potential of obtaining a near-zero TRU mass balance (i.e., the net TRU production per assembly) and low power peaking factor. The radiotoxicity of the nuclear waste sent to the repository environment and the impact of TRU stabilization on the future TRU stockpile were also evaluated. Assembly level mass flow analyses have shown that TRU mass balances in the range of 0.2 to 1.4 kg/assembly are achievable within 7 recycles of the TRU, compared with 6.5 kg/assembly for a reference UO{sub 2} assembly. The study also revealed that the radiotoxicity of the repository waste generated by these TRU-containing assemblies at 10 years after disposal is roughly half that of a reference UO{sub 2} assembly; furthermore, the radiotoxicity falls below that of natural uranium ore after about 500 years because only a small fraction of the TRU (0.1%) is passed to the waste repository. Finally, the future TRU stockpile could be reduced by implementation of TRU multi-recycling in the CORAIL or alternative assemblies in a …

In 1999, Argonne National Laboratory-East (ANL-E) designed and installed a series of engineered plantings consisting of a vegetative cover system and approximately 800 hybrid poplars and willows rooting at various predetermined depths. The plants were installed using various methods including Applied Natural Science's TreeWell{reg_sign} system. The goal of the installation was to protect downgradient surface and groundwater by hydraulic control of the contaminated plume. This goal was to be accomplished by intercepting the contaminated groundwater with the tree roots, removing moisture from the upgradient soil area, reducing water infiltration, preventing soil erosion, degrading and/or transpiring the residual VOCs, and removing tritium from the subsoil and groundwater. The U.S. EPA Superfund Innovative Technology Evaluation Program (SITE) and ANL-E evaluated the demonstration. The effectiveness of the various plantings was monitored directly through groundwater measurements and samples, and indirectly via soil moisture probes, plant tissue analysis, microbial studies, geochemical analysis, and sap flow monitoring. A weather station with data logging equipment was installed. ANL-E modeled the predicted effect of the plants on the groundwater using MODFLOW. The demonstration has lasted three growing seasons and continues. This paper presents the results of the sampling, monitoring, and modeling efforts to date. The project was not …

We review predictions, based on the nonrelativistic QCD factorization framework, for the polarizations of prompt J={psi}'s and {Upsilon}(nS)'s produced at the Fermilab Tevatron. We also discuss the effect of relativistic corrections on the theoretical prediction for the polarization of prompt J={psi}'s at the Tevatron.

The authors present IV and CV curves for irradiated prototype n{sup +}/n/p{sup +} silicon pixel sensors, intended for use in the BTeV experiment at Fermilab. They tested pixel sensors from various vendors and with two pixel isolation layouts: p-stop and p-spray. Results are based on exposure with 200 MeV protons up to 6 x 10{sup 14} protons/cm{sup 2}.

The Mie model is widely used to analyze light scattering from particulate aerosols. The Diesel Particle Scatterometer (DPS), for example, determines the size and optical properties of diesel exhaust particles that are characterized by measuring three angle-dependent elements of the Mueller scattering matrix. These elements are then fitted using Mie calculations with a Levenburg-Marquardt optimization program. This approach has achieved good fits for most experimental data. However, in many cases, the predicted real and imaginary parts of the index of refraction were less than that for solid carbon. To understand this result and explain the experimental data, we present an assessment of the Mie model by use of a light scattering model based on the coupled dipole approximation. The results indicate that the Mie calculation can be used to determine the largest dimension of irregularly shaped particles at sizes characteristic of Diesel soot and, for particles of known refractive index, tables can be constructed to determine the average porosity of the particles from the predicted index of refraction.